Wards



R. J. & A. EDWARDS. MACHINERY 0R APPARATUS FOR GRINDING AND POLISHING TUBES (No Model.)

OR BARS.

Patented Mar. I

wsz Jf J5. Wm; 00, l, TVA/ELM,

n, n. c.

UNITED STATES PATENT OFFICE.

RICHARD JOHN EDXVARDS AND ARC-HER EDVARDS, OF LONDON, ENGLAND.

MACHINERY 0R APPARATUS FOR GRINDING AND POLISHING TUBES OR BARS.

SPECIFICATION forming part of Letters Patent No. 469,910, dated March 1, 1892.

Application filed February 18, 1891. Serial No. 381,882- (No model.) Patented in England February 18, 1887, No. 2,588, and in France January 4, 1888, No. 187,972.

To all whom it may concern.-

Be it known that We, RICHARD J OHN ED- WARDS and ARCHER EDWARDS, both subjects of the Queen of Great Britain, residing at London, in the county of Middlesex, England, have jointly invented a certain new and useful Improvement in Machinery or Apparatus for Grinding and Polishing Tubes or Bars, (for which We have received Letters Patent in England, No. 2,588, dated February 18,

1887, and in France, No. 187,972, dated Janu-' ary 4, 1888,) of which the following is a specification.

Our present invention relates to machinery or apparatus used for grinding and polishing the surface of cylindrical tubes or bars; and it has for its objects to provide means by which such tubes-or bars of different diameters can be ground and polished, to adjust the position of the grinding or polishing disks easily and quickly, to prepare the surface of the grinding or polishing disks, and to support the tube or bar While being ground and polished, and prevent the escape of dust. To attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a side view of the machine, Fig. 2 a front view, and Fig. 3 a top view. Fig. 4 is a separate front view ofone of the grinding and polishing disks, and Fig. 5 is a separate view of the device by which tubes or bars of different diameters are supported while being ground or polished and dust is prevented from escaping.

Similarletters refer tosiinilar parts throughout the several views.

In Figs. 1, 2, and 3, a and b are two disks of suitable size and material arranged face to face upon separate spindles c and d, revolving in suitable-bearings e and f, and driven at the desired speed by a belt g or other means by steam or other power. The opposing faces of the two disks a and b are prepared with a soft materialsuch as feltin the following way, as illustrated on a larger scale in Fig. 4c.

We take one or more strips h of thick felt and we attach them to the face of the disk by means ofv glue or cement or other suitable means, the strip or strips being arranged in a spiral form, as shown in Fig. 4, the inner end being fixed at a short distance from the center of the disk and the strip being then wound spirally round upon the face of the latter, a narrow space being left between each sucg ceeding coil until the circumference of the disk is reached. The strips are preferably out from a sheet of felt, the cut edges being arranged outward upon the disk. Other suitable material may, however, be used.

The faces of the two disks a and I), prepared as described, are not arranged exactly parallel to each other; but one of them (a in Fig. 1) is arranged so that its revolving face is vertical, while the other I) is inclined more or less, so that while its lower edge nearly touches the first disk its upper edge is separated more or less from the latter, an angular space being left between them, as shown. The bearings carrying one or both disks may be made I movable and adjustable, so that the latter are made to revolve at any desired distance apart, and the angle formed by their faces may be increased or diminished, as desired.

In Fig. 1 the bearings of the shaft d, which 7 carries the disk b, are shown carried upon the movable arm 1, turning upon the center la, so that a greater or less space and a difierent angle are obtained between the faces of the disks a and b by varying the position of the arm '5. A handle is shown at Z operating a screw m, by which the position of the arm 2' can be altered and adjusted.

The shaft or spindle d is driven by a belt 41, set in motion bya pulley upon the spindle c and passing over the pulleys 0 0' p p, of which 19 is concentric with the center 70, so that the position of the arm 2' can be altered without interfering with the movement of the disk A supply of emery, sand, glass, or other abrasive powder of a proper degree of fineness is supplied between the spiral surfaces of the felt upon the disks (1. and b, and the tube 00 to be ground or polished is introduced 5 into the angular space between the two disks, and while being turned slowly round is at the same time fed forward in the direction of its length, becoming perfectly ground or polished by the surfaces of the felt and the abrasive 10o powder which they carry.

The disks a and b may be made to revolve at the same or at different speeds, and the effect of their movement upon the surface of the tube is to grind or polish the latter very uniformly and efiectively in the manner desired. If the disks revolve at diiferent speeds, the tube is fed forward by their movement.

The whole of the grinding apparatus is preferably inclosed in a case r, Fig. 2, the tube ac being fed in through a suitable hole on one side and delivered, after having been ground and polished, through a corresponding hole through the other side of the case.

In Fig. 1 a somewhat modified arrangement of disks is shown at the end of the shaft or spindle c. The two disks A and B are both carried by the same spindle; but one of them B has the face to which the felt strip is attached made conical, so that an angular space is left between the faces of the two disks, into which the tube X to be ground or polished is introduced, as shown in dotted lines. The conical disk B can be adjusted and fixed upon the spindle at any desired distance from the disk A. p

In order that tubes of any desired size may be conveniently brought to and delivered from the grinding-disks in the way just described, we use the arrangement illustrated in Figs. 2 and 5.

We make through the frame or case r of the machine upon each side a hole 5 to receive the largest-sized tube which is to be used, and we arrange a revolving disk 1, turning upon a center upon each side of the machine, so that the hole is covered by the face of the disk near its outer edge. We make a series of holes corresponding with the difierent-sized tubes which are to be treated through the disk 75, so that by turning round the latter upon its center either of them can be made to correspond with the hole 8 in the side of the case r. The disks t are covered with a thick covering u of felt, through which holes are made size of the tube being regulated by one disk receding from the other.

Means for creating a current of air through or around the tubes when the latter are being ground or polished for the purpose of keeping them cool may be adapted.

Vhat we claim, and desire to secure by Letters Patent, is

1. In a machine forgrinding and polishing tubes or bars, the combination of the spindle 0, disk at, pivoted arm @bearings f, spindle d, disk 11, pulleys 0 0 p p, and driving-belt at, substantially as set forth.

2. In a machine for grinding and polishing tubes and bars, the combination, with the re volving disk a, faced with abrading material, of the movable disk I), set at an inclination to the said disk a, the pivoted arm .t', carrying the journals for the saiddisk b, and the screw 'm and handle Z for moving the said arm backward or forward and varying the distance between the said disks, substantially as described.

3. The combination of the diskt and felt disk it, having holes 'v of dilferentsizes, with the holes 8 in the casing '1', substantially as set forth.

In testimony whereof We have hereunto set our hands in the presence of two witnesses.

RICHARD JOHN EDWARDS. ARCHER EDWARDS. Witnesses:

J ANASS A. RIDGWAY, ARTHUR ERNEST EDWARDS. 

